How can I play co-op with my brother?

:Warning: Question / Support

I've tried to play co-op with him: I'm on PC, using xbox app to play astroneer, and he's on xbox. We've both made worlds and tried to join each other but it doesn't work. It says he's joinable, but it comes up with this:

https://preview.redd.it/p5jaouqomctg1.png?width=735&format=png&auto=webp&s=a097426399455c0cd476515bec427dbf4826659c

How do I fix this?

Posted Apr 5, 2026, 10:27 AM UTC